Okay, so my five year old kid wants to know why when Obi-Wan is fighting Darth Vader in Episode IV, he puts his light saber away and "disappears". I've tried to explain that he was helping Luke get away, but he isn't really buying that.

"Why didn't he just fight Darth Vader?"
"Why didn't he kill Darth Vader?"
"Why did he put his light saber away?"
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